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Finding the Fourth Proportional to 1,080.75, 1,621.35 and 350.40

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Solution

The fourth proportional to 1,080.75, 1,621.35 and 350.40 is: 525.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.75 : 1,621.35 = 350.40 : x
  2. Step 2: Convert to fraction form
    1,080.75/1,621.35 = 350.40/x
  3. Step 3: Cross multiply
    1,080.75x = 1,621.35 × 350.40
  4. Step 4: Simplify right side
    1,080.75x = 568,121.04
  5. Step 5: Solve for x
    x = 568,121.04/1,080.75
  6. Step 6: Final answer
    x = 525.67

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.